Improvement in padlocks



M. C. HAWKINS.

PAD-LOCK.

Patented Aug*.8, 1876.

(@WITNESSES w ATTORNEYS.

MPETERB. PHOTO-UTHOGRAPHER. WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

MOSES G. HAWKINS, OF EDINBQROUGH, PENNSYLVANIA.

IMPROVEMENT IN PADLOCKS.

Specification forming part of Letters Patent No. 180,875, dated August8, 1876; application filed J annary 29, 1876.

To all whom it may concern:

Be it known that I, Moses 0. HAWKINS, of Edinborough, in the county ofErie and State of Pennsylvania, have invented a new and ImprovedCombination-Lock and Key, of

which the following is a specification:

The invention consists of a combinationpadlock, consisting, essentially,of a cylindrical shell or casing, adapted for receiving and locking abolt carrying a hasp and a series of tumblers, which are shifted ormoved by a key of a peculiar construction, as will be hereinafter morefully described.

Figure l is a sectional elevation of my improved lock, .taken on theline a: m of Fig. 2. Fig. 2 is a section taken on line y 3 of Fig. 1.Fig. 3 is a horizontal section on line 22 of Fig. 1. Fig. 4 is asectional elevation of the key, taken on line to. to, Fig. 5; and Fig. 5is a side elevation of the key. Fig. 6 is a detail view of the hasp andits bolt portion. Fig. 7 represents the staple-shaped device fordistributing the tumblers, and the springs for exerting pressure on thetumblers and on the slidingbolt.

Similar letters of reference indicate corresponding parts.

Arepresents the hollow cylinder forming the case of the lock, which ismade open at its end for the purpose of receiving the boltshaped portionB, containing the locking-bolt O and tumble-rs D, and carrying the haspon the outer end. The portion B, with its hasp, is prevented fromsliding out of the case A, when unlocked, by means of the stop screw orpin a on the portion B and the top ledge or flange of the 'case A. Theend of the'hasp enters the case through the notch G, and then, byturning the bolt portion B and the hasp, the latter will be retained bythe edge or top flange of the casing A, as shown at F. When the hasp isturned the bolt 0 is projected from the portion B and caused to enter anotch, H, in the case A, which serves to lock the hasp. The bolt is madeto slide into this notch by the springs I pressing its inclined shoulderJ against the. cam K, applied to the bolt portion B. The tumblers are atthe same time shifted by the springs and staple-shaped bar L, so thatthey hold the bolt up against cam K, which keeps it in the notch.

The tumblers are pivoted on the rod M, and have notches N in the edges,which swing along the bolt to let the bolt be pushed down into them, soas to slide back out of notch H, for unlocking when they are adjusted inline with it by the key. Said key has two sets of bits, 0, which act onthe tumblers through the holes P, on opposite sides of the pivot M, toadjust the notches of the tumblers to the bolt, some of the tumblersbeing swung in one direction and some in the other, and all beingbrought into position when the two bits for each tumbler are broughtinto contact with it. The tumblers are by this arrangement set wholly bythe key alone, thus dispensing with springs to each tumbler for thispurpose; but they are displaced by springs when the bolt is locked.

When the bolt is shifted into the notch H,

the opposite end swings out of the notch Q, the inclined wall of whichhelps to slide it;

but this notch is mainly to provide space in which the bolt can swingaround when unlocked, to let the hasp come to the notch G.

When the boltis unlocked it is pushed back out of the notch H by theinclined wall S, against which it is pressed by turning the hasp tonotch G.

The tumblers are shifted on the pivot M for changing the combination,and the key is constructed of as many interchangeable plates as thereare tumblers, which are changed when the tumblers are. The pivot istaken out for changing the tumblers.

The plates of the key may be locked by a stud, B, so as to be used as asolid key, or they may hang loose on the keyring, so that any one of theplates may be pushed through the others to change the combination.

Having thus described my invention, I claim as new and desire to secureby Letters Patcut-- 1. A lock-body in one piece, with one portion ofhasp jointed to the other portion, and centrally locked by the revolvingshell or outer case, as shown and described.

2. The bolt 0, cam K, and tumblers D, combined with part B and the caseA, having key-ring, may be changed by passing one plate through theopening; of: another, ubstantially as described.

MOSES UHAMPEN HAWKINS.

Witnesses J. W. GOODELL, H. O. GERRISH.

